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CN1924624B - Substrate film for optical sheet, optical sheet and backlight unit - Google Patents

Substrate film for optical sheet, optical sheet and backlight unit Download PDF

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Publication number
CN1924624B
CN1924624B CN2006101152007A CN200610115200A CN1924624B CN 1924624 B CN1924624 B CN 1924624B CN 2006101152007 A CN2006101152007 A CN 2006101152007A CN 200610115200 A CN200610115200 A CN 200610115200A CN 1924624 B CN1924624 B CN 1924624B
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light
optical sheet
mentioned
optical
substrate film
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CN2006101152007A
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CN1924624A (en
Inventor
原田贤一
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EWA Co Ltd
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EWA Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0056—Means for improving the coupling-out of light from the light guide for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0226—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures having particles on the surface
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0257—Diffusing elements; Afocal elements characterised by the diffusing properties creating an anisotropic diffusion characteristic, i.e. distributing output differently in two perpendicular axes
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051—Diffusing sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0065—Manufacturing aspects; Material aspects
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G02F1/133536—Reflective polarizers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/13362—Illuminating devices providing polarized light, e.g. by converting a polarisation component into another one
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00—Materials and properties
    • G02F2202/40—Materials having a particular birefringence, retardation

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)
  • Polarising Elements (AREA)

Abstract

Disclosed is a substrate film for an optical sheet, an optical sheet and a backlight unit capable of markedly enhancing utilization efficiency of rays of light and improving luminance. The substrate film for an optical sheet is made of a transparent resin and is formed into a rectangular shape, which substrate film for the optical sheet has an optical anisotropy, and having an absolute value of the angle of the crystal orientation with respect to the short side orientation being pi/16 or greater and 3pi/16 or less. The crystal orientation preferably follows the phase advancing axial orientation. The substrate film for the optical sheet has a retardation value such that average intensity of transmitted beam I<A> becomes equal to or greater than 0.75 so as to be capable of converting polarization orientation of outgoing rays of light of the optical waveguide plate or the like to the transmission axial orientation of the polarizing plate or the like. The retardation value is preferably 140nm or greater and 390 nm or less. The transparent resin is preferably polyethylene terephthalate or polycarbonate. The optical sheet has the substrate film for the optical sheet, and an optical layer.

Description

Substrate film for optical sheet, optical sheet and backlight unit
Technical field
The present invention relates to improve especially the utilization factor of light, promote substrate film for optical sheet, optical sheet and backlight unit that brightness improves.
Background technology
Characteristics such as it is slim by effectively utilizing for liquid crystal indicator (LCD), light weight, power consumption are low are used for flat-panel monitor more, and purposes enlarges year by year.What this liquid crystal indicator was popularized is from the luminous back lighting mode of back side illuminaton liquid crystal layer, is provided with the edge light type below liquid crystal layer, under backlight unit such as type.The backlight unit 50 of above-mentioned edge light type is basically shown in Fig. 9 (a), has strip light 51 as light source, make the end along the rectangular plate shape light guide plate 52 that lamp 51 is provided with, be located at light guide plate 52 lip-deep light diffusing sheets 53, be located at the prismatic lens 54 of light diffusing sheet 53 face side.
The function of this backlight unit 50 is described now.At first, the light that is incided light guide plate 52 by lamp 51 is the reflection spot or reflector plate (not shown) reflection at light guide plate 52 back sides, from the surperficial outgoing of light guide plate 52.Then, incide prismatic lens 54, go up the 54a of prism portion that form by prismatic lens 54 surfaces and get the beam projecting that the peak value form distributes along normal directions roughly from the light of light diffusing sheet 53 outgoing.
Like this, from the light of lamp 51 outgoing by light diffusing sheet 53 diffusions, via prism 54 along normal direction roughly with the refraction of peak value form, and then the whole liquid crystal layer (not shown) on the illumination surface.Have again,, change, protect the 54a of prism portion gently or prevent purposes such as liquid crystal boards such as polaroid and prism 54 adhesions for the optically focused characteristic that makes above-mentioned prism 54 though do not show brightly among the figure.Also be provided with light diffusing sheet in the surface of prismatic lens 54.
Light diffusing sheet 53 set in the above-mentioned backlight unit 50 is general shown in Fig. 9 (b), light diffusion layer 57 (for example can open flat 7-5305 communique with reference to the spy, the spy opens 2000-89007 communique etc.) with plastic residuite floor 56 and lamination on these hypothallus 56 surfaces.This kind light diffusion layer 57 generally is to include resinous microballon 59 in the bonding agent 58 of transparent resin system, realizes light diffusion function by microballon 59.
The desired characteristic of LCD is easily observed (wide field's angling) according to purposes and variation for example has bright (high brightnessization) in recent years, and energy-conservation, thin lightization etc. particularly will inevitably require high brightnessization.But,, only be to have become the situation of being unable to catch up with that chases after by lamps 51 such as light guide plate 52 in the improvement backlight unit 50 and cold-cathode tubes in order to guarantee brightness simultaneously in the theory of the LCD that keeps lighting.
Have, polaroid has become integral vitals among the LCD again.What the polaroid of general usefulness adopted is to demonstrate by the what is called that a light absorbing durection component allows remaining polarized component see through to absorb dichromatic element.This polaroid will absorb 50% light in order to obtain polarized light on the principle, this just becomes the main reason of the utilization factor that reduces LCD light.
Recently, in order to improve the utilization factor of this light, be provided with reflecting polarizer in the top of backlight unit 50.This reflecting polarizer makes seeing through of polaroid with seeing through axle component former state, and polarized component is in addition turned back to the below, comes thus light is utilized again.But even this backlight unit 50 with the reflecting polarizer lamination, in fact because the equal loss is reflected in the thermal absorption of periodic light, the utilization factor of light also can only realize about 75%.
Summary of the invention
In view of above-mentioned these unfavorable situations, the object of the present invention is to provide the utilization factor that can significantly improve light, promote substrate film for optical sheet, optical sheet and backlight unit that brightness improves by leaps and bounds.
The inventor furthers investigate found that of polarization characteristic of each textural element of backlight unit, polarized component from the light guide plate chamfered edge eyeglass of lamination (or on the light guide plate surface) emergent ray is many in the vertical direction with respect to lamp, since with polaroid plate or reflecting polarizer to see through axle inconsistent, cause the utilization factor of light low.
In order to address the above problem, the present invention proposes the substrate film for optical sheet of the transparent resin system that forms rectangle, this matrix membrane is characterised in that it has the optical anisotropy, with respect to the absolute value of the crystalline axis direction angle of short side direction at π/more than 16 and 3 π/below 16.Here so-called " with respect to the crystalline axis direction angle of short side direction " is lip-deep angle, and meaning turns right turns left to be the angle of "-" for "+".
Because this substrate film for optical sheet has the optical anisotropy, and with respect to the angle absolute value of short side direction crystalline axis direction at π/more than 16 and 3 π/below 16, just can be from the polarization direction (in-plane that means polarisation of light component maximum of the light guide plate chamfered edge eyeglass of lamination (or on the light guide plate surface) emergent light, below herewith) transform to the direction of principal axis that sees through of polaroid or reflecting polarizer, can see through and the utilization factor of raising light effectively as the catoptrical component that reclaims thereby can make over.
As above-mentioned crystalline axis direction superfacies direction of principal axis preferably, axially be the reference direction method that decides above-mentioned angle with respect to short side direction and compare to the situation that is benchmark with superfacies in this wise with slow axis, can improve the utilization factor of light to a certain degree.
Polarizer P and analyzer Q are set in the two sides of this matrix membrane, in linearly polarized light (amplitude=1 by polarizer P, see through light intensity=1) through this matrix membrane and by under the situation of analyzer Q, if the superfacies direction of principal axis of the crystallographic axis on this matrix membrane surface axially is directions X and Y direction with stagnating, the thickness of matrix membrane is d, the refractive index of x direction and y direction is nx and ny (nx ≠ ny), the angle that sees through between direction of principal axis of crystalline axis direction and polarizer P is ψ, the angle that sees through between direction of principal axis that sees through direction of principal axis and analyzer Q of polarizer P is β, then the displacement of the light by analyzer Q can be represented by following formula (1), seeing through light intensity can be represented by following formula (2), and the average light intensity I that sees through of three kinds of wavelength of RGB ACan be by following formula (3) expression, set β=π/4, ψ=-when (β/2), preferably have and make the average light intensity I of seeing through that calculates by formula (3) ABecome the length of delay more than 0.75, this length of delay Re is the value of calculating by Re=(ny-nx) d.
E(d，t)＝sinψcos?Θ(d，t)sin(β+ψ)+cosψcos{Θ(d，t)+δ(d)}cos(β+ψ)…(1)
I = ( 1 / To ) &Integral; 0 To E 2 dt . . . ( 2 )
I A＝(I 1+I 2+I 3)/3…(3)
At this, λ: wavelength, c: the light velocity, t: the time, K=2 π/λ, Θ (d, t)=k (nxd-ct), δ (d)=k (ny-nx) d.I 1, I 2, I 3Be that incident light wavelength with respect to polarizer P is respectively λ 1: 430nm, λ 2: 550nm, λ 3: during 610nm, the light transmission light intensity of the light by analyzer Q.
This substrate film for optical sheet with above-mentioned delay value can make the phase differential optimization, the light of outgoing such as light guide plate is transformed to polaroid etc. effectively see through the direction of axle, thereby can improve the utilization factor of light significantly.
Be preferably in more than the 140nm with below the 390nm as above-mentioned folding length of delay.Like this, decide more than the 140nm and length of delay below the 390nm by getting, just can transform to the direction of principal axis that sees through of polaroid etc. from the polarization direction of the light of outgoing such as light guide plate effectively, this substrate film for optical sheet is also easily made simultaneously.
As above-mentioned transparent resin preferably polyethylene terephthalate (PET) and polycarbonate.This PET has the higher character of length of delay, makes length of delay as mentioned above most preferably easily and reliably.As for polycarbonate, the control of length of delay is easy.
The optical sheet of the present invention that is used to address the above problem has the matrix membrane that this optical sheet uses and is stacked and placed on optical layers on this substrate film for optical sheet.This optical sheet can transform to polaroid etc. effectively with the polarization direction of the light of outgoing such as light guide plate by its used matrix membrane and see through direction of principal axis.So, when this optical sheet for example is used for liquid crystal indicator, can improves the utilization factor of light significantly and promote high brightnessization and province to change.
Can have multiple light diffusing agent and bonding agent thereof as above-mentioned optical layers.Aforementioned optical sheet is that so-called light diffusing sheet has the function that has the diffusion transmitted light by the multiple light diffusing agent in the optical layers, can promote high brightnessization and economize and can change by substrate film for optical sheet.
In addition, also can have the lens arra that constitutes by many lenticules as above-mentioned optical layers.The so-called micro-lens sheet of this optical sheet portion has height optically focused by microlens array for transmitted light, and towards the normal direction refraction, optical functions such as diffusion can promote high brightnessization and economize and can change by substrate film for optical sheet.
At above-mentioned substrate film for optical sheet on the other hand, also can in bonding agent, have the adherent layer that disperses microballon.Like this, by adherent layer is set, for example just can prevent optical layers and the light guide plate of being located at the inboard here in liquid crystal indicator in the other direction of substrate film for optical sheet, prismatic lens etc. are bonding.
So, in the backlight unit that the liquid crystal indicator of guide surface is used in that the light of being dispersed by lamp is disperseed, can have as mentioned above owing to have above-mentioned optical sheet and to make this optical sheet will transform to the axial function that sees through of polaroid etc. effectively from the polarization direction of the light of outgoing such as light guide plate, thereby can significantly improve the utilization factor of the light of launching from lamp, promote current social desired high brightnessization, economize and to change and slim light-weighted requirement.
As mentioned above, substrate film for optical sheet of the present invention and optical sheet have the axial function that sees through that polarization direction with the light of outgoing such as light guide plate transforms to polaroid etc. effectively.So the backlight unit of the present invention that has possessed this kind optical sheet can significantly improve the utilization factor of the light of being launched by lamp, can promote current social desired high brightnessization, economize and can change and slim lightweight.
Description of drawings
Fig. 1 is the mode view that shows the substrate film for optical sheet of bright an embodiment of the present invention.
Fig. 2 is the pattern skeleton view of the polarized light anisotropy assay method of emergent raies such as explanation light guide plate.
Fig. 3 is the curve map of the polarized light anisotropy measurement result of emergent raies such as explanation light guide plate.
Fig. 4 is the polarized light characteristic measurement result's of emergent raies such as explanation light guide plate curve map.
Fig. 5 (a) with (b) for show bright crystallographic axis angle ψ with on average through light intensity I AThe analog result of relation and the curve map of measured value.
Fig. 6 is for showing bright length of delay and the average light intensity I of seeing through AThe curve map of the analog result of relation.
Fig. 7 is the mode sectional drawing of the optical sheet (light diffusing sheet) that shows the substrate film for optical sheet of bright employing Fig. 1.
Fig. 8 (a) with (b) be the mode view and the mode sectional drawing of optical sheet (micro-lens sheet) of the substrate film for optical sheet that shows bright employing Fig. 1.
Fig. 9 (a) with (b) be the pattern skeleton view that shows bright general edge light type backlight unit and the mode sectional drawing that shows bright general light diffusing sheet.
Embodiment
Below with reference to corresponding accompanying drawing in detail form of implementation of the present invention is described in detail.
The substrate film for optical sheet 1 of Fig. 1 is the resin system film that forms rectangle.Formation material as this substrate film for optical sheet 1 can adopt transparent particularly water white synthetic resin.Be not particularly limited for this synthetic resin, PET, Polyethylene Naphthalate, acrylic resin, polycarbonate, polystyrene, polyolefin, cellulose acetate, weatherability polyvinyl chloride etc. are for example arranged.Wherein, the transparency, intensity is high, later described length of delay easily the PET of control or polycarbonate for well, particularly with the Polyethylene Naphthalate that can improve softness for well.
The thickness of this substrate film for optical sheet 1 (average thickness) though do not have special restriction, should more than the 10 μ m with below the 250 μ m, and preferably more than the 20 μ m with below the 188 μ m.If the thickness of this substrate film for optical sheet 1 does not reach above-mentioned scope, when being used to form the polymer masses of light diffusion layer etc., coating just easily takes place to curl, make undesirable situations such as difficult treatment.On the contrary, when the thickness of this substrate film for optical sheet 1 surpasses the brightness that above-mentioned scope will reduce liquid crystal indicator, and if strengthen the thickness of backlight unit, this has just run counter to the requirement of liquid crystal indicator slimming.
This substrate film for optical sheet 1 is anisotropy optically, specifically, has the different birefringence of refractive index in in-plane.Utilize this birefringence, this substrate film for optical sheet 1 can be the changeable direction of polarization of transmitted light to the direction of hoping.
This substrate film for optical sheet 1 has the angle and the length of delay of optimized crystalline axis direction, they will in below by example with the simulation explanation.
The anisotropic affirmation of polarized light intensity from the light of outgoing such as light guide plate
As shown in Figure 2, the structure of edge light type backlight unit is at A: the prismatic light guide plate is all-in-one-piece situation and B: the situation of prismatic light guide plate and the combination of chamfered edge eyeglass, carried out field angle brightness measuring with the perpendicular direction of direction of lamp.At this moment, regulate the angle of the polarizing filter of analyzer, measured
(1) with the polarized component of lamp vertical direction (it is vertical that the analyzer polarizing filter sees through axle), with
(2) with the polarized component of lamp parallel direction (it is parallel that the analyzer polarizing filter sees through axle).The result is shown in Fig. 3.
As shown in Figure 3, the prismatic light guide plate at above-mentioned A is whole situation.Export near big 60 °～75 ° at light, polarized light anisotropy height has polarized component along the big light output characteristics of the vertical direction of lamp.In the situation of prismatic light guide plate/chamfered edge eyeglass of above-mentioned B, in have near 0 ° of the frontal polarized light anisotropy strong, along the big light output characteristics of the vertical direction polarized component of lamp.
Affirmation from the polarization characteristic of emergent raies such as light guide plate
Confirm for polarization characteristic, simultaneously and have only the backlight unit contrast of normal direction light guide plate from the back lighting equipment emergent ray of light guide plate shown in Figure 2/chamfered edge lens structure.To be made as 0 ° with the perpendicular direction of the direction of lamp, stacked polaroid on described backlight unit at first makes the axle that sees through of this polaroid rotate to 10 ° from 0 ° of position at every turn, has measured the front face brightness data.Carried out identical mensuration for the backlight unit that has only the normal direction light guide plate.The result is shown in Fig. 4.
As shown in Figure 4, with the texture ratio that has only the normal direction light guide plate, in the structure of prismatic light guide plate/chamfered edge eyeglass, in vertical component and parallel component, can confirm that polarized component has big deviation with respect to lamp.Specifically, in the back lighting of prismatic light guide plate/chamfered edge lens structure, the polarization of polarized component compares approximately big 20% at the component of vertical direction with the component aspect parallel with respect to lamp.
The optimization simulation of crystallographic axial angle and phase differential
According to the said determination result, carried out to the polarization characteristic with the light of outgoing such as light guide plate can transform to seeing through on the axle of polaroid efficiently, obtain the calculating of the optimal value of the crystallographic axial angle of this substrate film for optical sheet 1 and phase differential.
Polarizer P and analyzer Q are set on the two sides of this matrix membrane, consider that the linearly polarized light (amplitude=1 sees through light intensity=1) by polarizer P sees through this matrix membrane, by the situation of analyzer Q.
If the superfacies direction of principal axis of the crystallographic axis on this matrix membrane surface and slow axis direction are x direction and y direction, the thickness of matrix membrane is d, the refractive index of x direction and y direction is that (the angle between direction of principal axis of seeing through of nx ≠ ny), crystalline axis direction and analyzer P is that the angle through between direction of principal axis that sees through direction of principal axis and analyzer Q of ψ, polarizer P is β for nx and ny, then the displacement of the light by analyzer Q can be represented by above-mentioned formula (1), seeing through light intensity can be represented by above-mentioned formula (2), and the average light intensity I that sees through of three kinds of wavelength of RGB ACan represent by above-mentioned formula (3).
Optimum polarization axle angle
According to the said determination result, be the direction vertical from the polarization of light direction of light guide plate outgoing with the lamp direction, usually the direction of principal axis that sees through of polaroid with respect to the direction vertical with the lamp direction is ± π/4.For this reason, in above-mentioned formula (1), (2) and (3), establish β=π/4, ψ and the average light intensity I of seeing through have been calculated in Re=λ/2 ARelation, its result is shown among Fig. 5 (a).
Test findings according to Fig. 5 (a) and " with respect to the angle [alpha] of the crystalline axis direction of short side direction and the relation of front face brightness " described later is judged, use in the substrate membrane 1 at this optical sheet, as the crystalline axis direction (x relative with short side direction, y) absolute value of angle α, be preferably above and 3 π in π/16/below 16, especially preferably at 3 π/more than 32 and 5 π/below 32, especially with π/8 the bests.In addition, why the angle [alpha] of crystalline axis direction being got the above specific absolute value, is because the direction of principal axis that sees through of general polaroid is ± π/4 sometimes with respect to the direction vertical with the lamp direction.
Have, using above-mentioned length of delay is the substrate film for optical sheet 1 of 320nm, the latter is laminated on the backlight unit of light guide plate/chamfered edge lens structure again, makes the crystallographic axis revolution, has measured surface brightness.This result's the crystallographic axis angle and the relation of front face brightness are shown among Fig. 5 (b), the ψ of same Fig. 5 of relation (a) of crystallographic axial angle and front face brightness shown in Fig. 5 (b) and the average light intensity I that sees through ARelation have matching, this illustrates that the simulation of above-mentioned crystallographic axial angle is suitable.
The optimal delay value
According to said determination result and analog result, calculated and be set at best β=π/4, ψ=-on average see through light intensity I during (β/2) angle ARelation with length of delay the results are shown among Fig. 6.
Judge according to Fig. 6, in this substrate film for optical sheet 1, make the average light intensity I of seeing through AThe length of delay that reaches more than 0.75 is desirable, and makes the average light intensity I of seeing through ABe that length of delay more than 0.9 is better, as for making the average light intensity I of seeing through ABe that length of delay more than 0.95 is then especially good.
As the concrete length of delay in this substrate film for optical sheet.Test findings according to Fig. 6 and " length of delay and front face brightness relation " described later is judged: make the average light intensity I of seeing through AThe 140nm that reaches more than 0.75 is above with below the 390nm, 680nm is above with below the 1040nm, 1350nm above with 1610nm with inferior be desirable, especially preferably 190nm is above with below the 330nm, and best especially especially be that 240nm is above with below the 280nm.Set the length of delay in the above-mentioned scope, can be effectively the changeable direction of polarization of emergent raies such as light guide plate be seen through direction of principal axis and the also easily manufacturing of this substrate film for optical sheet to polaroid etc.
Above-mentioned crystalline axis direction is advisable to get the superfacies direction of principal axis.The utilization factor of light is improved by being the method that decides of benchmark with the superfacies direction of principal axis when being benchmark above-mentioned angle [alpha] with respect to short side direction, can improve the brightness of backlight unit with the slow axis direction.This fact can be obtained proof by the test findings of " superfacies direction of principal axis and slow axis direction are with the relation of front face brightness " described later.
As the manufacture method of this substrate film for optical sheet 1, there is no particular restriction in the time having above-mentioned crystallographic axial angle and length of delay.For example, crystallographic axial angle can be by the tensile force in the uniaxial tension processing such as adjusting PET, temperature etc., or by die-cut position and the die-cut angle of adjusting biaxially-stretched film in Punching Technology, and can control in the scope of the present invention.In addition, length of delay, the tensile force during stretch process, temperature, thickness etc. are may command also.
Above-mentioned substrate film for optical sheet 1 can be with the changeable direction of polarization of light guide plate (or being laminated to the lip-deep chamfered edge eyeglass of light guide plate) the emergent ray direction of principal axis that sees through to polaroid or reflecting polarizer, makes over can efficiently see through and can improve the utilization factor of light as the catoptrical component that reclaims.
The optical sheet 10 of Fig. 7 is to have the light diffusing sheet that makes transmitted light diffusion function (being the directivity diffusion function towards normal direction optically focused in detail in the diffusion while).This optical sheet 10 have the invention described above substrate film for optical sheet 1, be laminated to this matrix membrane 1 lip-deep optical layers (light diffusion layer) 11 and be laminated to anti-bonding coat 12 on this matrix membrane 1 inside surface.
Optical layers 11 is included in the bonding agent 14 that substrate film for optical sheet 1 surface roughly evenly is provided with many light diffusing agents 13 and these many light diffusing agents 13.These light diffusing agents 13 are that bonding agent 14 covers.Like this, by many light diffusing agents 13 contained in the optical layers 11, the light that can make optical layers 11 see through face side from the inboard spreads equably.In addition, these many light diffusing agents 13 roughly are formed with fine concavo-convex on the surface of optical layers 11 equably.Like this, by the optical sheet 10 surperficial refraction actions of going up the lens of the micro concavo-convex that forms, light is spread more well.In addition, though the average thickness of optical layers 11 does not have special restriction, for example get that to be decided to be about 1 μ m above and below the 30 μ m.
Light diffusing agent 13 is to have the particle that makes the light diffusion property, roughly is divided into inorganic filler and organic filler.For example can adopt silicon dioxide, aluminium hydroxide, aluminium oxide, zinc paste, barium sulphide, magnesium silicate or their potpourri as inorganic filler.As for example available acrylic resin of organic filler, acrylonitrile resin, polyurethane, Polyvinylchloride, polystyrene, polyacrylonitrile, polyamide etc.Wherein with transparent high acryl resin for well, and particularly best with polymethylmethacrylate (PMMA).
There is no particular restriction for the shape of light diffusing agent 13, for example can be for spherical, and spindle, needle-like, bar-shaped, cubic, tabular, flakey, fibrous etc., and this respect superior spherical microballoon of light diffusing preferably.
The particle mean size lower limit of light diffusing agent 13 is with 1 μ m, and particularly 2 μ m, especially 5mm are best, and its upper limit is then with 50 μ m, particularly 20 μ m and especially 15 μ m be best.When the particle mean size of diffusant 13 did not reach above-mentioned scope, optical layers 11 surfaces that formed by light diffusing agent 13 concavo-convex little probably can not be satisfied as the necessary light diffusing of light diffusing sheet.On the contrary, when the particle mean size of light diffusing agent 13 exceeded above-mentioned scope, the thickness of optical sheet 10 increased and is difficult for evenly spreading.
Lower limit as the compounding amount of light diffusing agent 13 (the formation material polymers of bonding agent 14 forms the compounding amount that part converts with respect to the solid of 100 parts of matrix polymers in forming), with 10 parts, particularly 20 parts, especially be advisable for 50 parts, and limit with 500 parts as going up of this compounding amount, particularly 300 parts, especially 200 parts for well.This is because the compounding amount of light diffusing agent 13 when not reaching above-mentioned scope, light diffusing is insufficient, when exceeding above-mentioned scope, then can reduce the effect of fixed light diffusant 13, in addition, when the face side in prismatic lens is provided with the situation of so-called top with light diffusing sheet, owing to unnecessaryly have height that diffusivity is arranged, as the compounding amount of light diffusing agent 13 with more than 10 parts with below 40 parts, particularly with more than 10 parts below 30 parts for well.
Bonding agent 14 is to make the polymer mixture that comprises matrix polymer carry out crosslinking curing to form.By bonding agent 14, light diffusing agent 13 just fixedly installs on the surface of substrate film for optical sheet 1 with the density that roughly is equal to.As for being used for forming in the polymer mixture material of bonding agent 14, except that matrix polymer, for example suitably compounding with fine inorganic filler, hardening agent, plastifier, spreading agent, various equal paints, ultraviolet light absorber, antioxidant, viscosity modifying agent, lubricant.Light stabilizer etc.
There is no particular restriction as above-mentioned matrix polymer, for example can adopt acrylic resin, polyurethane, polyester, fluorine resin, silicone-based resin, polyimide, epoxy resin, ultraviolet curing resins etc. can use mixing more than a kind or 2 kinds of above-mentioned polymkeric substance.Particularly as above-mentioned matrix polymer, good with processing characteristics, easily the polyvalent alcohol that forms above-mentioned optical layers 11 by devices such as coatings is advisable.In addition, be used for the matrix polymer self of bonding agent 14, consider with transparent being advisable from improving the photopermeability viewpoint, and water white best.
As above-mentioned polyvalent alcohol for example have the monomer component polymerization of hydroxyl unsaturated monomer and polyvalent alcohol, the polyester polyol that obtains under the superfluous condition of hydroxyl can mix them and use with monomer or more than 2 kinds.
As the unsaturated monomer of hydroxyl, (a) for example there are acrylic acid 2-hydroxyl ethyl ester, acrylic acid 2-hydroxypropyl acrylate, methacrylic acid 2-hydroxyl ethyl ester, methacrylic acid 2-hydroxypropyl acrylate, allyl alcohol, homoallylic alcohol, styron, butenol etc. to close the hydroxyl unsaturated monomer; (b) for example ethylene glycol, oxirane, propylene glycol, epoxypropane, butylene glycol, epoxy butane, 1, divalent alcohol or epoxy compound that two (methylol) cyclohexanes of 4-, phenyl glycidyl ether, capric acid ethylene oxidic ester, プ ラ Network ヤ Le FM-1 (ダ イ セ Le chemical industry Co., Ltd. system) wait for example react the hydroxyl unsaturated monomer of gained with unsaturated carboxylic acids such as acrylic acid, methacrylate, maleic acid, fumaric acid, butenoic acid, itaconic acids.By selecting polymerization more than a kind or 2 kinds in the unsaturated monomer of these hydroxyls, can make polyvalent alcohol.
Above-mentioned polyvalent alcohol also can from the ethylene unsaturated monomer of the following stated, select more than a kind or 2 kinds with aforementioned (a) with (b) in the hydroxyl polymerization of unsaturated monomers selected make and these ethylene unsaturated monomers are: ethyl acrylate, the acrylic acid n-propyl, isopropyl acrylate, n-butyl acrylate, the special butyl ester of acrylic acid, EHA, ethyl methacrylate, the methacrylate n-propyl, the methacrylate isopropyl ester, the positive butyl ester of methacrylate, the special butyl ester of methacrylate, the methacrylate Octyl Nitrite, methacrylic acid glycidyl ester, the methacrylate cyclohexyl, styrene, vinyltoluene, the 1-methyl styrene, acrylic acid, methacrylate, vinyl cyanide, vinyl acetate, propionate, stearic acid vinyl ester, allyl acetate, diallyl adipate, the itaconic acid diallyl, diethyl maleate, vinyl chloride, vinylidene chloride, acrylamide, N hydroxymethyl acrylamide, N-butoxymethyl acrylamide, diacetone acrylamide, ethene, propylene, isoprene etc.
To include polyvalent alcohol number-average molecular weight that the monomer component polymerization of hydroxyl unsaturated monomer obtains more than 1000 and below 500000, preferably 5000 or more with below 100000.In addition, hydroxyl value be more than 5 with below 300, be more preferably 10 or more and 200 below, and preferably more than 20 and below 150.
The polyester polyol that obtains under the superfluous condition of hydroxyl can be with (C) ethylene glycol for example, diglycol, propylene glycol, dipropylene glycol, 1, the 3-butylene glycol, 1, the 4-butylene glycol, 1, the 5-pentanediol, neopentyl glycol, 1, the 6-hexanediol, 1, the 10-decanediol, 2,2,4-trimethyl-1, the 3-pentanediol, trimethylolpropane, hexanetriol, glycerine, pentaerythrite, cyclohexanediol, hydrogenated bisphenol A, two (methylol) cyclohexane, quinhydrones two (hydroxyethyl ether), three (hydroxyethyl) isocyanuric acid ester, multivalence such as xylidine ethylene glycol alcohol and (d) maleic acid for example, fumaric acid, succinic acid, hexane diacid, decanedioic acid, azelaic acid, trimesic acid, terephalic acid, phthalic acid, polyprotonic acids such as m-phthalic acid are at propylene glycol, hexanediol, polyglycol, react under the condition that hydroxyl value in the multivalence alcohol such as trimethylolpropane is Duoed than the carboxyl number of above-mentioned polyprotonic acid and make.
The polyester polyol that makes under the superfluous condition of above-mentioned hydroxyl number-average molecular weight 500 or more and below 300000, preferably more than 2000 and below 100000, and its hydroxyl value is more than 5 below 300, better more than 10 and below 200, is preferably in 20 or more with below 150.
Polyvalent alcohol as the matrix polymer of this base polymer mixing material is to be made by the monomer mixing material polymerization of above-mentioned polyester polyol and hydroxyl unsaturated monomer, and this has (methyl) acrylic monomers.With described polyester polyol or acrylic polyol is the weatherability height of the bonding agent 14 of matrix polymer, can suppress the flavescence of optical layers 11 etc.In addition, for this polyester polyol and acrylic polyol, both can use one of them also can use its both.
Hydroxyl value in above-mentioned polyester polyol and the acrylic polyol is made as 1 molecule more than 2, though this is not had special restriction, but if hydroxyl value is 10 when following in the solid-state part, the crosslinked minimizing of counting might reduce the rerum natura of coated film such as solvent resistance, water tolerance, thermotolerance, skin hardness.
Can in the polymer mixture that forms bonding agent 14, comprise small inorganic filler.By making bonding agent 14 comprise small inorganic filler.Can improve the thermotolerance of optical layers 11 and then optical layers 10.There is no particular restriction as the inorganics that constitutes this small inorganic filler, but preferably use inorganic oxide.This class inorganic oxide is defined as based on metallic element, by having constituted all oxygen metal compounds of three-dimensional network with combining of oxygen atom.For example should choose the element in the II-VI family in the periodic table of elements as the metallic element that constitutes inorganic oxide, and be more preferably the element of from III-V family, choosing.Particularly the element of choosing from Si, Al, Ti and Zr is best, and the cabosil of metallic element silicon is optimal being used as small inorganic filler aspect raising thermotolerance effect and the homogeneous dispersiveness.The shape of this small inorganic filler with shape of particle arbitrarily such as spherical, syringe needle, tabular, flakey, clastic, does not have particular restriction.
The particle mean size lower limit of small inorganic filler is advisable with 5nm, be more preferably 10nm, and its upper limit is good with 50nm, is more preferably 25nm.When the particle mean size of small inorganic filler did not reach above-mentioned scope, the surface energy of filling agent raise, and easily causes cohesion, on the contrary, when particle mean size surpasses above-mentioned scope, can gonorrhoeaization under the influence of short-wavelength light, can not keep the transparency of optical sheet 10 fully.
For the matrix polymer with small inorganic filler is the lower limit of 100 parts the compounding amount compounding amount of inorganics composition (just), by solid-state part convert with 5 parts for well, and be best with 50 parts, and its upper limit with 500 parts for well, 200 parts are better, 100 parts best.When the compounding amount of small inorganic filler did not reach above-mentioned scope, optical sheet 10 was afraid of that difficulty has sufficient thermotolerance, on the contrary, when this compounding amount surmounts above-mentioned scope, just is difficult to compounding in polymer mixture, might reduce the light transmission rate of optical layers 11.
Should use the agent material that makes organic polymer fixing in its surface as above-mentioned small inorganic filler.This organic polymer is fixing uses small inorganic fillings by using, can seek to improve the dispersiveness in bonding agent 14 and the compatibility of raising and bonding agent 14, molecular weight, shape, composition for this organic polymer, functional group has or not etc. that there is no particular restriction, can use organic polymer arbitrarily.Can adopt straight chain shape, branch-like and crosslinked shape as for the shape of organic polymer.
As the concrete resin that constitutes above-mentioned organic polymer structure (methyl) acryl resin is for example arranged, polyester such as polyolefin such as polystyrene, polyvinyl acetate, tygon or polypropylene, Polyvinylchloride, polyvinylidene chloride, PET and their multipolymer with carry out partially modified resin etc. by functional groups such as amino, epoxy radicals, hydroxyl, carboxyls.Wherein with the organic polymer of (methyl) acrylic acid structure unit of comprising (methyl) acrylic resin, (methyl) acrylic acid-styrene resin, (methyl) acrylic acid-polyester resin etc. serve as must composition the good film forming characteristics that has.On the other hand, preferably have the resin of compatibility with the matrix membrane of above-mentioned polymer mixture, thus with resin identical in the contained matrix membrane in composition and the polymer mixture for the most desirable.
Even including organic polymer in particulate, small inorganic filler also is fine.So just can give the fuse inorganics of small inorganic filler with suitable pliability and toughness.
Above-mentioned organic polymer can adopt and contain alkoxy, and the small inorganic filler that its content is fixed with organic polymer with every 1g is more than the 0.01mmol and below the 50mmol best.By this alkoxy, can improve the compatibility and the dispersiveness in bonding agent 14 of the matrix resin of isomorphism composite adhesives 14.
Above-mentioned alkoxy shows understands the RO base that is attached in the metallic element that forms the particulate skeleton, is can be with the alkyl of this R displacement, and the RO base in the particulate can be identical or inequality.The object lesson of R has methyl, ethyl, n-pro-pyl, isopropyl, normal-butyl etc., to adopt with the metal of the small inorganic filler of formation is the best of identical metal alkoxide, when small inorganic filler was cabosil, looking silicone with employing was that the alkoxy of metal is best.
Not having special restriction though be fixed with the containing ratio of the organic polymer in the small inorganic filler of organic polymer, is benchmark with small inorganic filler, and preferably 0.5% (weight) is above and below 50% (weight).
Adopt hydroxyl as being fixed to above-mentioned organic polymer on the particle inorganic filler, in the polymer mixture that constitutes bonding agent 14, can choose at least a in melamine compound and the amino resin from having more than 2 the polyfunctional isocyanate's compound with the functional group of hydroxyl reaction.Like this, small inorganic filler is combined by cross-linked structure with the matrix resin of bonding agent 14, has obtained excellent storage stability, and the anti-property be infected with (stain resistance), flexibility, weatherability etc. can also make to film simultaneously to have gloss.
Is best as above-mentioned matrix polymer with the polyvalent alcohol with naphthenic base.Like this, by naphthenic base being introduced in the polyvalent alcohol as the matrix polymer that constitutes bonding agent 14, make bonding agent 14 have very high drainage, hydrophobicitys such as water tolerance, can improve high temperature, the stiffness of this optical sheet 10 and dimensional stability etc. under the super-humid conditions.In addition, can also improve and organic polymer films is fixed to the uniformly dispersed of the compatibility of lip-deep small inorganic filler and small inorganic filler.
There is no particular restriction as above-mentioned naphthenic base, and cyclobutyl, cyclopentyl, cyclohexyl, suberyl, ring octyl group, ring nonyl, ring decyl, ring undecyl, cyclo-dodecyl, ring tridecyl, ring myristyl, cyclopentadecane base, ring cetyl, ring heptadecyl, ring octadecyl etc. for example can be arranged.
Polyvalent alcohol with above-mentioned naphthenic base can carry out copolymerization by the polymerism unsaturated monomer with naphthenic base tries to achieve, and this polymerism unsaturated monomer with naphthenic base is the polymerism unsaturated monomer that has a naphthenic base in molecule at least.There is no particular restriction as this polymerism unsaturated monomer, and (methyl) cyclohexyl acrylate is for example arranged, (methyl) acrylic acid methyl cyclohexane ester, (methyl) acrylic acid tert-butyl group cyclohexyl, (methyl) acrylic acid cyclo-dodecyl ester etc.
In polymer mixture, can contain isocyanates as hardening agent, contain isocyanates in the polymer mixture and just more firm cross-linked structure can be arranged, can further improve the rerum natura of the coating film of optical layers 11 by making.Can adopt and the identical material of aforementioned polyfunctional isocyanate's compound as this isocyanates, wherein can prevent aliphatic isocyanate the best of coating film flavescence.
Particularly polyvalent alcohol when the matrix polymer, can use hexamethylene diisocyanate as compounding to the hardening agent in the polymer mixture, one of in isoprene diisocyanate and the Xylene Diisocyanate or the potpourri more than two kinds.Adopted the curing reaction speed that has increased polymer mixture behind this hardening agent, even thereby use that to give small inorganic filler be antistatic agent with the kation of dispersion stabilization, also can compensate the curing reaction speed that reduces by this antistatic agent.In addition, the raising of the curing reaction speed of above-mentioned polymer mixture also helps the even dispersion of small inorganic filler in bonding agent.Optical sheet 11 just can suppress deflection and the flavescence due to hot and the ultraviolet ray etc. especially as a result.
Also can in above-mentioned polymer mixture, be mixed with antistatic agent, after forming bonding agent 14 in this polymer mixture that is mixed with antistatic agent, find that this optical sheet 10 has anti-electrostatic effect, can prevent, be difficult for overlapping harmful situation because of the static electrification generation with prismatic lens etc. because of absorption dust.In addition, will make surfaces of tacky on the surface or produce dirt, it be mixed in polymer mixture, then can eliminate above-mentioned disadvantage in this wise as if antistatic agent is applied to.There is no particular restriction as this antistatic agent, can be that kations such as antistatic agent, quaternary ammonium salt, imidazolinium compounds are that nonionics such as antistatic agent, polyglycol system, Tween-60, glycollyl amine are that macromolecules such as antistatic agent, polyacrylic acid are antistatic agent for example with negative ion such as alkyl sulfate, alkylphosphonics, or the like.Be that antistatic agent is best wherein, only need to add and just can play antistatic effect on a small quantity with the bigger kation of antistatic effect.
Adherent layer 12 has the bonding agent 16 of many microballons of being located in substrate film for optical sheet 1 inside surface 15 and these microballons 15.This bonding agent 16 is to be formed through crosslinking curing by the polymer mixture identical with the bonding agent 14 of above-mentioned optical layers 11.In addition, can adopt light diffusing agent 13 identical materials with optical layers 11 as the material of microballon 15.The thickness of adherent layer 12 (thickness that does not have bonding agent 16 parts in microballon 15 parts) is not though there is special restriction, and it is above with below the 10 μ m for example to be about 1 μ m.
The compounding amount of microballon 15 is less, and microballon 15 is scattered in the bonding agent 16 each other discretely.In addition, there is part microballon 15 on the lower surface of optical sheet 10, to form protuberance.So when optical sheet 10 during with the light guide plate lamination, surfaces such as outstanding microballon 15 parts and light guide plate contact, rather than the total inner surface of optical sheet 10 and light guide plate etc. are touched and are closed.So just can prevent that optical sheet 10 and light guide plate etc. are bonding, can reduce the brightness disproportionation of liquid crystal indicator picture.
The following describes the manufacture method of optical sheet 10, the method comprises following each procedure: (a) light diffusing agent 13 is mixed in the polymer mixture that constitutes bonding agent 14 to make light layer mixing material; (b) optical layers is laminated on the surface of substrate film for optical sheet 1 with mixing material, makes it to be solidified to form optical layers 11; (c) microballon 15 is mixed in the polymer mixture that constitutes bonding agent 16, makes the adherent layer mixing material; (d) adherent layer is laminated on the inside surface of substrate film for optical sheet 1 with mixing material, makes it to solidify and lamination becomes adherent layer 12.As above-mentioned optical layers be there is no particular restriction with mixing material and adherent layer with the apparatus and method that mixing material is laminated to substrate film for optical sheet 1, for example can adopt bar formula spreader, board-like spreader, spinner, roller spreader, photogravure seal to be coated with coating processes such as device, curtain flow coater, spraying and serigraphy, or the like.
Optical sheet 10 is by the refraction of the micro concavo-convex that forms in the reflection on contained light diffusing agent 13 interfaces in the optical layers 11 and refraction and optical layers 11 surfaces, and has very high light diffusion function (directivity diffusion function).In addition, optical sheet 10 can transform to the polarization direction of emergent raies such as light guide plate the direction of principal axis that sees through of polaroid etc. effectively by substrate film for optical sheet 1.Therefore, when optical sheet 10 being used for for example liquid crystal indicator, can improve the utilization factor of the light that lamp sends significantly, promote high brightnessization, economize and to change and then save spaceization.
The optical sheet 20 of Fig. 8 is a height optically focused, and having can be towards the so-called micro-lens sheet of optical functions such as the refraction of normal direction side, diffusion.This optical sheet 20 has substrate film for optical sheet 1 and is laminated to this matrix membrane 1 lip-deep optical layers 21.
Optical layers 21 has the matrix membrane of being laminated to 1 lip-deep tabs 22 and is formed at this tabs 22 lip-deep microlens arrays 23.Optical layers 21 also can not comprise tabs 22 but be made of microlens array 23.That is to say and on the surface of substrate film for optical sheet 1, directly to form microlens array 23.
Optical layers 21 is particularly formed by water white transparency synthetic resin owing to the palpus transmitted light.The synthetic resin that can be used as optical layers 21 for example has PET, Polyethylene Naphthalate, acryl resin, polycarbonate, polystyrene, polyolefin, cellulose acetate, weatherability vinyl chloride, activation-energy-ray-curable resin etc.Wherein best is superior ultraviolet curing resin, the electron beam gel-type resin isoradial gel-type resin of formability that makes microlens array 23, and the PET that the superior transparency and intensity are arranged.In addition, except that above-mentioned synthetic resin, all right compounding is filling agent, plastifier, stabilizing agent, anti-degradation agent and spreading agent etc. for example in optical layers 21.
Microlens array 23 is made of many lenticules 24.This lenticule 24 is semisphere (comprising the shape approximate with semisphere), saliently is located at the face side of substrate film for optical sheet 1.In addition, lenticule 24 is not limited to above-mentioned hemispherical convex lenses, also can be the lenticule of hemispherical concavees lens.The lenticule of this hemispherical concavees lens can have and above-mentioned lenticule 24 same graceful function.
Lenticule 24 is located on the surface of substrate film for optical sheet 1 with closeer geometry.Specifically, lenticule 24 is located on the surface of substrate film for optical sheet 1 with the equilateral triangle grid pattern.Therefore, the centre distance of lenticule 24 (P) is certain fully with the spacing (S) of lens.This laying pattern can the most thickly be laid lenticule 24.In addition, being not limited to as the laying pattern of lenticule 24 can fine and close above-mentioned equilateral triangle grid pattern of filling, and for example can be square lattice pattern or pattern at random.If the employing random pattern then can reduce the generation of interference stripes when overlapping this optical sheet 20 on other opticses.
As the lower limit of the diameter (D) of lenticule 24 with 10 μ m, 100 μ m particularly, especially 200 μ m are best, the upper limit of this diameter D is then with 1000 μ m, particularly 700 μ m are best.When the diameter (D) of lenticule 24 than 10 μ m hours, the diffraction influence increases, and easily reduces optical property and color is decomposed, and causes quality to descend.On the other hand,, thickness is increased and uneven luminance, cause optical quality and reduce if the diameter (D) of lenticule 24 surpasses 1000 μ m.But when this diameter (D) when 100 μ m are above because the number of the lenticule 24 on the per unit area tails off, just easily increase the i.e. area of this optical sheet 20 of micro-lens sheet, so just can reduce when making technical difficulty with reduce cost.
As the lower limit of the surface roughness (Ra) of lenticule 24, serve as special good with 0.01 μ m for good 0.03 μ m, then be advisable and 0.07 μ m preferably as for its upper limit with 0.1 μ m.Like this, when the surface roughness (Ra) of lenticule 24 was on above-mentioned lower limit, the microlens array 23 of this optical sheet 20 just more easily was shaped, and can reduce the technical difficulty in the manufacturing and reduced cost.On the other hand, make the surface roughness (Ra) of lenticule 24 be no more than above-mentioned going up in limited time, then can reduce lenticule 24 lip-deep light scattering, the result can improve the light-focusing function of lenticule 24 and towards the reflective functions of normal direction, since the good optical function of this respect, the high brightnessization that can seek frontal.
As the height (H) of lenticule 24 to the lower limit of the aspect ratio (H/R) of radius of curvature R with 5/8 for well, 3/4 is best, its upper limit then with 1 for well.Like this, the aspect ratio (H/R) by making lenticule 24 is when getting above-mentioned scope, and the refraction action of the lens in the lenticule 24 will be remarkable, can improve the optical function of the optically focused etc. of optical sheet 20 significantly.
The lenticular spacing of lenticule 24 is from (S; P-D) interval with respect to diameter (D) is special better for getting well with 1/5 with 1/2 than the upper limit of (S/D).Lenticular spacing by making lenticule 24 under the above-mentioned upper limit, just can reduce the flat that is unprofitable to optical function from (S), significantly improves the optical functions such as optically focused of optical sheet 20.
As the lower limit of the filling rate of lenticule 24 with 40% for good special good with 60%.Get above-mentioned lower limit when above at the filling rate that makes lenticule 24, just can improve the occupation rate of lenticule 24 in these optical sheet 20 surfaces, improve the optical functions such as optically focused of this optical sheet 20 significantly.
Above-mentioned aspect ratio (H/R), interval are to derive according to the brightness analysis simulation of the non-sequential ray trace of using Monte Carlo method than the numerical range of (S/D) and filling rate.
With 1.3 for well, 1.45 is best as the lower limit of the material refractive index that constitutes optical layers 21, and its upper limit is then with 1.8 for well, and 1.6 is best.Among above-mentioned scope, be best with 1.5 as the refractive index of the material that constitutes optical layers 21.When the refractive index of the material that constitutes optical layers 21 is in above-mentioned scope the time, the lens refraction action of lenticule 24 will produce remarkable result, can further improve the optical functions such as optically focused of optical sheet 20.
Particular restriction can be there is no as long as can form the goods of said structure as the manufacture method of optical sheet 20, various methods can be adopted.The manufacture method of optical sheet 20 has particularly;
(a) on the sheet spare mould of upset shape with microlens array 23 surfaces with synthetic resin and substrate film for optical sheet 1 lamination in this order, peel off this sheet spare mould and form the method for optical sheet 20.
(b) resin with sheet spareization heats again, is clipped in to have substrate film for optical sheet 1 and have again simultaneously between the metal die and sheet metal of microlens array 23 surface upset shapes, and pressurization is to duplicate the method for shape;
(c) make molten resin and substrate film for optical sheet 1 by between the roll gap of the roll-type mould of the upset shape that has microlens array 23 surfaces on the side face and another roller, above-mentioned shape is duplicated the optical sheet forming method of extruding;
(d) coat on the substrate film for optical sheet 1 with ultraviolet curing resin, cramping is in the sheet die with upset shape same as described above, between metal die or the roll-type mould, this shape copying to uncured ultraviolet curing resin, is shone the method for solidifying ultraviolet curing resin with ultraviolet ray.
(e) uncured uv curing resin is filled and is applied on the metal die or roll-type mould with upset shape same as described above, be attached on the above-mentioned mould with substrate film for optical sheet 1 even the pressure, ultraviolet ray method of type resin is admittedly solidified in this ultraviolet ray irradiation.
(f) from minute nozzle with injection such as the ultraviolet curing resin of uncured (aqueous) or be ejected on the substrate film for optical sheet 1 to form lenticule 24 and make it the method for solidifying again.
(g) use the electron beam gel-type resin to replace the method for ultraviolet curing resin.
As the above-mentioned method of making by mould with microlens array 23 upset shapes, for example can on matrix material, form mottled space pattern by the photoresist material, by making this space pattern add heat flow and curved surface making microlens array mould, on this microlens array mold surface,, peel off this metal level again and just can make die needed by electric smelting casting lamination metal level.In addition, also can adopt method described in top (f) to make this microlens array mould.
Utilize above-mentioned manufacture method, can be easily and form the microlens array 23 of arbitrary shape reliably.In view of the above can be easily and adjust the diameter (D) of the lenticule 24 that constitutes microlens array 23 reliably, aspect ratio (H/R), at interval than (S/D) and filling rate etc., the result also just controls the optical function of this optical sheet 20 easily and reliably.
Optical sheet 20 by microlens array 23 have high optically focused, towards optical functions such as normal direction refraction, diffusions.And can be easily and control this class optical function reliably.So optical sheet 20 for example can be controlled.The peak value direction of the light that incides prismatic lens of backlight unit is reflected to normal direction with optimal inclination angle.In addition, optical sheet 20 can will transform to the direction that polaroid etc. sees through axle from the polarization direction of emergent raies such as light guide plate effectively by this substrate film for optical sheet 1.So, when this optical sheet 20 for example is used for liquid crystal indicator, can significantly improve the utilization ratio of light, can promote high brightnessization, economize and can change, and then can save the space.
" lenticule " spoken of above is meant that the interface is the micro lens of spherical calotte shape, for example is equivalent to semisphere convex lens, semisphere concavees lens etc." diameter (D) is meant the diameter of lenticule bottom or opening "." highly (H) " is meant vertical range from its basal surface to top during for convex lens when lenticule, when lenticule is meant vertical range from its opening surface to bottommost during for concavees lens." lenticular spacing from " is meant the bee-line between a pair of lenticule of adjacency." filling rate " is meant the lenticular area ratio on the per unit area in surface projection's shape." equilateral triangle grid pattern " is meant that each place, summit in this equilateral triangle is provided with the pattern that lenticule forms by the equilateral triangle cutting of same shape with the surface.”
The backlight unit that liquid crystal indicator of the present invention is used has rectangular light guide plate, along the lamp of light guide plate long side ora terminalis setting, be laminated to the lip-deep light diffusing sheet of light guide plate, the optical sheet of rectangles such as prismatic lens.Aforesaid optical sheet 10,20 can be used as this light diffusing sheet, prismatic lens etc.The axle that sees through that is laminated to the polaroid of the lip-deep liquid crystal board of this backlight unit or reflecting polarizer generally becomes ± angle of π/4 with respect to the direction of lamp, as mentioned above, because having, optical sheet 10,20 polarization direction of emergent raies such as light guide plate can be transformed to effectively the direction that polaroid etc. sees through axle, just can significantly improve the utilization factor of the light that lamp launches, can promote the high brightnessization of current social desirability, economize and to change and slimming.
Substrate film for optical sheet of the present invention is not limited to above-mentioned embodiment with the optical sheet of having used this matrix membrane.For example this substrate film for optical sheet also can stacked ultraviolet light absorber layer, top protective seam etc.In addition, the optical layers of this optical sheet also is not limited to the light diffusion layer of Fig. 7 and the microlens array of Fig. 8, for example also can be by constituting by the many prisms portion of strip setting, cylindrical lens portion etc.
The lenticule that constitutes above-mentioned microlens array can form the partial shape of major axis towards the elliptical area of normal direction.If adopt this lenticule, then can reduce spherical aberration and then reduce optical loss with major axis towards the partial shape of the elliptical area of normal direction.Can improve with respect to transmitted light to the light-focusing function of face side, diffusion function, conversion are with respect to the optical functions such as angle of normal direction side.Major axis radius (the R of this elliptical area L) with respect to minor axis (R S) aspect ratio (R L/ R S), from reducing the purpose of lenticular spherical aberration effectively, be preferably in more than 1.05 with below 1.7.
The lenticule that constitutes above-mentioned microlens array also can form major axis and be positioned at partial shape with the elliptical area of in-plane almost parallel.Thisly have major axis and be positioned at lenticule with the elliptical area partial shape of in-plane almost parallel if adopt, then can increase optically anisotropic function, specifically, in the lenticule with the optical function of major axis vertical direction greater than with the optical function of major axis parallel direction.
For above-mentioned ultraviolet light absorber, can replace in the bonding agent of above-mentioned optical layers 11 contained ultraviolet light absorber in 14 by the stacked UV-absorbing layer that contains ultraviolet light absorber, or be used in combination with it, can also make in the bonding agent 16 of adherent layer 12 or the substrate film for optical sheet 1 to contain ultraviolet light absorber.Can prevent the destruction of ultraviolet ray by the ultraviolet ray of launching equally by this method by the lamp of backlight unit to liquid crystal layer.
The antistatic layer that also can stackedly contain antistatic agent as for above-mentioned electrostatic prevention agent interfering is replaced in the bonding agent 14 of above-mentioned optical layers 11 and comprises the method for antistatic agent or use both simultaneously, also can in the bonding agent 16 of adherent layer 12 or substrate film for optical sheet 1, comprise this antistatic agent, after adopting these class methods, can make this optical sheet have anti-electrostatic effect, can prevent to adsorb dust, the harmful situation that causes for static such as be difficult to overlap with prismatic lens etc.
Embodiment
According to embodiment in detail the present invention is described in detail below, but is not the restriction that the present invention is done based on the description that this embodiment was done.
With respect to the crystalline axis direction angle [alpha] of short side direction and the relation of front face brightness
Change the position from the reel of the PET of biaxial stretch-formed mistake and take off, making crystalline axis direction has the square substrate film for optical sheet of all angles with respect to short side direction, and stacked thereon identical light diffusion layer is made light diffusing sheet.
The polaroid that these light diffusing sheets is assembled into liquid crystal cell see through axle with respect to the direction of lamp Liquid crystal module at 45 in the time, measured front face brightness.Crystallographic axial angle α and front face brightness are closed as shown in table 1 below.
Table 1
Crystalline axis direction angle [alpha] (radian) Crystalline axis direction angle [alpha] (degree) Front face brightness (cd/m 2)
0 0 752
π/16 11.25 925
3π/32 16.875 968
π/8 22.5 984
5π/32 28.125 970
3π/16 33.75 926
2π/8 45 750
3π/8 67.5 521
As shown in table 1, when with respect to the crystalline axis direction angle [alpha] of short side direction at π/when more than 16 and 3 π/16 are following, high front face brightness is arranged, also reduced the standard deviation that causes front face brightness because of angle [alpha].When the angle [alpha] of crystalline axis direction in that 3 π/when more than 32 and 5 π/32 were following, decapacitation had good front face brightness, the standard deviation of front face brightness can also be suppressed in about 3%.Be π/8 o'clock especially, can obtain the highest front face brightness in the angle [alpha] of crystalline axis direction.In addition, when the angle [alpha] of crystalline axis direction is negative value, be-45 ° Liquid crystal module with respect to the lamp direction for the axle that sees through of the polaroid of liquid crystal cell, can see having and above identical front face brightness.Thereby reality has proved above-described, the reliability of the present invention in the scope of specific crystallographic axis angle [alpha].
The relation of length of delay and front face brightness
PET or polycarbonate are made the matrix membrane with various length of delays by uniaxial tension, with these matrix membranes with β=π/4, ψ=-angle of (β/2) is arranged in the Liquid crystal module, measured to show brightness.The result is shown in the following table 2.
Table 2
Length of delay (nm) Front face brightness (cd/m 2)
16 503
30 516
120 715
140 778
190 902
240 972
260 977
280 975
330 903
390 768
410 720
480 602
560 598
870 827
1140 676
1780 598
2018 888
2250 639
4380 555
4800 643
As shown in table 2, the length of delay of actual measurement and the relation of brightness and analog result shown in Figure 6 have matching.The transmitance height of the partial polarization sheet that brightness is high.Carry out polarisation transformation for seeing through the axle component by the phase place matrix membrane.Specifically.When length of delay more than 140nm and below the 390nm, more than the 680nm and below the 104nm and more than the 1350nm and 1610nm when following, find to have high front face brightness.The luminance standard deviation can be controlled at about below 50%, special when length of delay more than the 140nm with below the 390nm, especially when length of delay more than 140nm with 390nm when following, substrate film for optical sheet 1 has good produceability, it is about 30% that the face internal standard deviation of length of delay is reduced to, and then can suppress the standard deviation of brightness.In addition, when length of delay more than 190nm and 330nm when following, can realize higher brightness and the luminance standard deviation is controlled to about below 10%, and then when length of delay more than 240nm with 280nm when following, front face brightness can be controlled in about 3% with respect to the rate of descent of peak brightness.So just, proved the reliability of aforesaid the present invention in specific range of delay values.
The relation of superfacies direction of principal axis and slow axis direction and front face brightness
Stacked light diffusion layer is made light diffusing sheet on the matrix membrane with predetermined retardation value, this light diffusing sheet is pressed β=π/4, ψ=-angle of (β/2) is located in the Liquid crystal module, slow axis direction and superfacies direction of principal axis measured front face brightness during as this angle reference.The result is as shown in table 3 below.
Table 3
Front face brightness (cd/m 2) Front face brightness relative value (%)
When the slow axis direction is benchmark 820 100
When the superfacies direction of principal axis is benchmark 828 101
As shown in table 3, when with the superfacies direction of principal axis being the angle [alpha] of the above-mentioned crystalline axis direction with respect to short side direction of benchmark decision, the slow axis direction is that the situation of benchmark is compared therewith, and the utilization factor of light is improved to some extent, and can improve the brightness of back lighting equipment.

Claims (7)

1. one kind disperses light that lamp launches and backlight unit that the liquid crystal indicator of guide surface side is used, it is characterized in that,
Have the reflecting polarizer that is configured in liquid crystal indicator and the optical sheet between the light guide plate,
This optical sheet comprises: form rectangle transparent resin matrix membrane and be stacked to optical layers on the face of this matrix membrane, wherein
This matrix membrane has the optical anisotropy, with respect to the absolute value of the crystalline axis direction angle of short side direction at π/3 π more than 16/below 16,
On two surfaces of this matrix membrane, be provided with polarizer P and analyzer Q, see through this matrix membrane and by under the situation of analyzer Q at the linearly polarized light by polarizer P, if the superfacies direction of principal axis of the crystallographic axis on this matrix membrane surface and slow axis direction are x direction and y direction, the thickness of matrix membrane is d, the refractive index of x direction and y direction is nx and ny and nx ≠ ny, the angle that sees through between direction of principal axis of crystalline axis direction and polarizer P is ψ, the angle that sees through between direction of principal axis that sees through direction of principal axis and analyzer Q of polarizer P is β, then the displacement of passing through the light of analyzer Q is represented by following formula (1), see through light intensity by following formula (2) expression, and the average light intensity I that sees through of three kinds of wavelength of RGB ABy following formula (3) expression, be configured to β=π/4, ψ=-during the angle of β/2, have the average light intensity I of seeing through that calculates by formula (3) ABecome the length of delay more than 0.75,
E(d，t)＝sinψcosΘ(d，t)sin(β+ψ)+cosψcos{Θ(d，t)+δ(d)}cos(β+ψ)···(1)
I = ( 1 / To ) &Integral; 0 To E 2 dt &CenterDot; &CenterDot; &CenterDot; ( 2 )
I A＝(I 1+I 2+I 3)/3···(3)
Wherein, the amplitude of above-mentioned linearly polarized light is 1, sees through light intensity to be 1; λ: wavelength; C: the light velocity; T: time, k=2 π/λ; Θ (d, t)=k (nxd-ct); δ (d)=k (ny-nx) d; I 1, I 2, I 3Be that incident light wavelength with respect to polarizer P is respectively λ 1: 430nm, λ 2: 550nm, λ 3: the light by analyzer Q during 610nm see through light intensity.
2. the backlight unit that liquid crystal indicator according to claim 1 is used is characterized in that, above-mentioned crystalline axis direction is the superfacies direction of principal axis.
3. the backlight unit that liquid crystal indicator according to claim 1 is used is characterized in that, above-mentioned length of delay is below the above 390nm of 140nm.
4. the backlight unit that liquid crystal indicator according to claim 1 is used is characterized in that, above-mentioned transparent resin is PET or polycarbonate.
5. the backlight unit of using according to each described liquid crystal indicator in the claim 1～4 is characterized in that, above-mentioned optical layers has many light diffusing agents and bonding agent thereof.
6. the backlight unit of using according to each described liquid crystal indicator in the claim 1～4 is characterized in that, above-mentioned optical layers has the microlens array that is made of a plurality of lenticules.
7. the backlight unit of using according to each described liquid crystal indicator in the claim 1～4 is characterized in that, has the adherent layer that is dispersed with microballon and forms in bonding agent on the another side of above-mentioned matrix membrane.
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